Help! Exotic Fish Pond...

DukeTogoG13MR

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Alright. Here is the deal... Just six months ago... I have purchased a 200 gal tank, and stocked it with fish, with which have rapidly grown. My 4 Sengal Bichirs went from being 3 inches to almost 8 inches, in the first two months, and now are around 13-14 inches and seem to still be groaning. Along with the rapid growths are my two brown african knives and two black ghost knives... My peacock eel is seems normal. The Burmese Boarder loaches seems to have the case of fishy 'roids as well because they are about 3-4 inches larger than what I've researched. Same with my green Cory cats, they have reached 4 and 5 inches. The only ones that seem to have stayed "normal" are the honey gouramis, my rubber lipped and high fin plecos, and as I'm typing this. The Angelfish that my wife had put in there last night as a Christmas gift is now gone... Pointing a finger at the knives and Bichir... Told her it was to small...
Now onto the point... I'm not about to buy or build another tank, this one is already huge enough, I was wondering. Seeing as I live in El Paso, Tx, if I made a pond in my backyard around 500+ gallons, with pumps, heaters, cleaners, etc. would these fish live??? Seeing as they destroy the guppies and neons I use to feed them, I could ditch the 10 gallon feeder/ breeder tank and move them to the 200 gallon tank.
I also thought Sengal Bichirs where lazy and ambush predators??? They race with the knife fish and even gang up on the feeders like a pack of wolves... Is this normal???

Growing*
 
They would probably do really well in a pond (and you will most likely see them grow to their full potential - my Bristle noses got huge being in a 1000L pond and are well over 15cm), Over heating maybe a problem but by placing the pond where it can get shade or have a shade cloth put over the top should help, also lots of water movement made by the filter and an added airstone will help cool the water.
When you say Green Cory Cat I think you might be talking about Emerald Cory's which are not a cory (but closely related) and are actually a Brochis species the most commonly found one is Brochis Splendens and these guys can get to be little bruisers but still peaceful and gentle in a tank. They may not be so good with predatory fish because if the larger fish trys to eat the catfish the catfish will lock it's spins and can effectivley choke to death the larger fish while the poor catfish also dies. It doesn't always happen but it has in the past to people.
 
TBH I don't think tropical fish belong in an unheated pond in Texas, during the winter, because right now it is in the 40's in fort worth. A pond would be perfect in the summer if you keep it shaded but it almost definitely won't work in the winter
 
The pond won't be finished until about spring time. The layout is two 500 gal pools connected by two 15 ft long x 2.5 ft wide x 2 ft deep streams. Ponds to the east and west, streams will be north and south. It's really to just buy me time for next winter in the hopes of constructing a bigger tank. Which is going to require me to knock out the wall between the front den and dining room. I bought the house. So I don't see what's wrong with it. I'm here for the long haul.
 
i live not to far away from you in san antonio, and i had the same idea you have now. unfortunately, the cold fronts took alot of my tropicals. i have tried different things to heat the pond(100 w light bulb in a bucket,inline heating,aquarium heaters) and the water still gets too cold.
 

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